{"id":16427,"date":"2022-10-19T14:13:41","date_gmt":"2022-10-19T14:13:41","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16427"},"modified":"2022-10-28T15:26:36","modified_gmt":"2022-10-28T15:26:36","slug":"superposition-galactique-dans-la-grande-ourse","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/10\/19\/superposition-galactique-dans-la-grande-ourse\/","title":{"rendered":"Superposition galactique dans la Grande Ourse"},"content":{"rendered":"<p><strong>Le bestiaire galactique est riche de nombreuses curiosit\u00e9s. Exemple avec SDSS J115331 et LEDA 2073461, deux galaxies qui se chevauchent.\u00a0\u00a0<\/strong><\/p>\n<h5>Perspective trompeuse :<\/h5>\n<p>Lorsque des galaxies interagissent, les forces de mar\u00e9e gravitationnelles \u00e9tirent les bellig\u00e9rants et leur donnent des formes torsad\u00e9es. La collision d\u00e9clenche \u00e9galement des flamb\u00e9es de naissances stellaires qui se traduisent par une profusion d\u2019\u00e9toiles bleues brillantes et de nuages \u200b\u200bde gaz. Autant de signes que l&#8217;on retrouve dans <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/01\/22\/arp-243-beau-resultat-de-deux-galaxies-collision\/\" target=\"_blank\" rel=\"noopener\">Arp 243<\/a>, ou encore avec <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/13\/hubble-saisit-une-scene-de-cannibalisme-galactique\/\" target=\"_blank\" rel=\"noopener\">NGC 2798\/2799<\/a>. Pourtant, rien de tout cela n\u2019est visible quand on regarde <a href=\"https:\/\/esahubble.org\/images\/potw2236a\/\" target=\"_blank\" rel=\"noopener\">ce clich\u00e9 r\u00e9alis\u00e9 par le t\u00e9lescope Hubble<\/a> :<\/p>\n<p><iframe loading=\"lazy\" title=\"Video of A Galactic Overlap\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/m-bzNvnCFXU?start=3&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Situ\u00e9 dans la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/08\/24\/la-chapelle-de-saint-bonnet-en-beaujolais-sous-la-grande-ourse\/\" target=\"_blank\" rel=\"noopener\">Grande Ourse<\/a>, le couple SDSS J115331 et LEDA 2073461 ne semble pas conna\u00eetre les tumultes engendr\u00e9s par une collision galactique. Et les astronomes l&#8217;ont bien compris : ces deux galaxies n&#8217;interagissent pas entre elles. Il se trouve que par un incroyable concours de circonstance, elles sont parfaitement align\u00e9es quand on les observe depuis la Terre ! Une situation rare, mais pas exceptionnelle. On la retrouve dans le cas de NGC 3314 :<\/p>\n<figure id=\"attachment_15061\" aria-describedby=\"caption-attachment-15061\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/galax.jpg\" rel=\"lightbox[16427]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15061\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/galax-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/galax-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/galax-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/galax-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/galax.jpg 1499w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15061\" class=\"wp-caption-text\">NGC 3314 est le r\u00e9sultat de l&#8217;alignement parfait de deux galaxies. \u00a9 ESO\/Iodice et al.<\/figcaption><\/figure>\n<p>L\u00e0 aussi, les deux galaxies (baptis\u00e9es A et B dans un grand \u00e9lan d&#8217;originalit\u00e9), sont sur notre ligne de vis\u00e9e, mais s\u00e9par\u00e9es entre elles de plusieurs dizaines de millions d&#8217;<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/09\/14\/ngc-1365-portrait-dune-elegante-galaxie-spirale-barree\/\" target=\"_blank\" rel=\"noopener\">NGC 1365, portrait d\u2019une \u00e9l\u00e9gante galaxie spirale barr\u00e9e<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/03\/pourquoi-le-coeur-de-la-galaxie-spirale-messier-94-est-il-si-brillant\/\" target=\"_blank\" rel=\"noopener\">Pourquoi le c\u0153ur de la galaxie Messier 94 est-il si brillant ?<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/08\/ce-fuseau-argente-ic-2233-est-une-galaxie-spirale-ultra-mince\/\" target=\"_blank\" rel=\"noopener\">Ce fuseau argent\u00e9, IC 2233, est une galaxie spirale ultra-mince<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Le bestiaire galactique est riche de nombreuses curiosit\u00e9s. Exemple avec SDSS J115331 et LEDA 2073461, deux galaxies qui se chevauchent.\u00a0\u00a0 Perspective trompeuse : Lorsque des galaxies interagissent, les forces de mar\u00e9e gravitationnelles \u00e9tirent les bellig\u00e9rants et leur donnent des formes torsad\u00e9es. La collision d\u00e9clenche \u00e9galement des flamb\u00e9es de naissances stellaires qui se traduisent par une &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/10\/19\/superposition-galactique-dans-la-grande-ourse\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Superposition galactique dans la Grande Ourse<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":16723,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3277,3276,734],"class_list":["post-16427","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-leda-2073461","tag-sdss-j115331","tag-telescope-hubble"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Superposition galactique dans la Grande Ourse<\/title>\n<meta name=\"description\" content=\"Le bestiaire galactique est riche de nombreuses curiosit\u00e9s. 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